Question

What's the velocity of a ball falling with 100 joules of kinetic energy and a mass of 2 kilograms?

А. 3 m/s
B. 5 m/s
C. 7 m/s
D. 8 m/s
E. 10 m/s

Answer 1

E

Step-by-step explanation:

kinetic energy of linear motion

`k.e = (1)/(2) m {v}^(2)`

kinetic energy, K.e= 100joules

mass, m = 2kg

velocity, v =?

substituting the values into the formula :

`100joules = (1)/(2) * 2kg * {v}^(2)`

`{v }^(2) = 100`

`v = √(100 )`

`v = 10m { \sec }^( - 1)`